* In ''Disney/TreasurePlanet'', the children of [[spoiler:Delbert and Amelia]] display this. The three girls are clearly modeled after their mother and the boy is clearly modeled after his father. They aren't even the same species! [[WildMassGuessing Unless they are, and the species has that particular sexual dimorphism.]]

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* In ''Disney/TreasurePlanet'', the children of [[spoiler:Delbert and Amelia]] display this. The three girls are clearly modeled after their mother and the boy is clearly modeled after his father.father (even inheriting his [[spoiler:poor eyesight]]). They aren't even the same species! [[WildMassGuessing Unless they are, and the species has that particular sexual dimorphism.]]

EitherOrOffspring is the supertrope, where . Compare with BizarreSexualDimorphism, where a single species has very different-looking genders, and PatchworkKids, where the children look (and often act) like a perfect mix of the parents. (Of course, with TertiarySexualCharacteristics, it's quite reasonable that these ''would'' be--and are--passed on from same-sex parent to child...)

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EitherOrOffspring SubTrope to EitherOrOffspring, which is the supertrope, where .about offspring of two-species couples only inheriting one species in general. SisterTrope to DominantSpeciesGenes, where one species dominates regardless of gender. Compare with BizarreSexualDimorphism, where a single species has very different-looking genders, and PatchworkKids, where the children look (and often act) like a perfect mix of the parents. (Of course, with TertiarySexualCharacteristics, it's quite reasonable that these ''would'' be--and are--passed on from same-sex parent to child...)

Compare with BizarreSexualDimorphism, where a single species has very different-looking genders, and PatchworkKids, where the children look (and often act) like a perfect mix of the parents. (Of course, with TertiarySexualCharacteristics, it's quite reasonable that these ''would'' be--and are--passed on from same-sex parent to child...)

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EitherOrOffspring is the supertrope, where . Compare with BizarreSexualDimorphism, where a single species has very different-looking genders, and PatchworkKids, where the children look (and often act) like a perfect mix of the parents. (Of course, with TertiarySexualCharacteristics, it's quite reasonable that these ''would'' be--and are--passed on from same-sex parent to child...)

* In ''Manga/OnePiece'', when fishmen and merfolk have children, the child will either be a pure fishman or a pure merman/mermaid, not a hybrid, due to the special genetics of their breed. Incidentally, it seems that are many more fishmen than fishwomen and many more mermaids than mermen.

* ''Franchise/{{Pokemon}}'' averts this. The child of two different Pokémon will always be the same species as the mother, unless the mother is a Ditto. For male-only species, such as Tauros and Hitmontop, they can only reproduce their own species by breeding with Ditto. This is justified, as all Pokémon species draw from the same gene pool, and are actually subspecies. Oddly, a Ditto can breed with any breedable Pokemon ''except'' another Ditto.\\\Played straight with certain Pokémon whose genders are so different that they are classified separately, but the above rules still apply when crossbreeding (e.g. the child of a female Nidoran will be a Nidoran of either gender, but the child of a male will be whatever species the mother is.) See also: HotSkittyOnWailordAction.

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* ''Franchise/{{Pokemon}}'' averts this. The ''Franchise/{{Pokemon}}'': Usually, the child of two different Pokémon will always be the same species as the mother, unless the mother is a Ditto. For male-only species, such as Tauros and Hitmontop, they can only reproduce their own species by breeding with Ditto. This is justified, as all Pokémon species draw from the same gene pool, and are actually subspecies. Oddly, a Ditto can breed with any breedable Pokemon ''except'' another Ditto.\\\Played straight with However, certain Pokémon whose have genders are so different that they are classified separately, but the above rules still apply when crossbreeding (e.g. the child of a female Nidoran will be a Nidoran of either gender, but the child of a male will be whatever species the mother is.) See also: HotSkittyOnWailordAction.

* In ''WesternAnimation/TheAmazingWorldOfGumball'', children whose parents are [[InterspeciesRomance different species]] seem to be either parent's species at random. Depending on how you look at it, the show is either an aversion or zigzags between straight and inversion.** Straight: Hector's dad is mentioned to be a giant like him, but his mother [[HotSkittyOnWailordAction is a human-sized witch.]]** Inverted: Gumball is the same species as his mom (a cat), his sister is the same species as his dad (a rabbit). Jamie's father is probably the same species as her (albeit with BizarreSexualDimorphism) but her mother, [[spoiler:the giant cube-shaped gym coach]], is probably something completely different. Richard is a rabbit like his mom, but it turns out his dad [[spoiler:is a rat]] (who otherwise looks ''extremely'' similar).

* In ''Fanfic/TheBridge'' this is how mermare reproduction works. Mermares are a OneGenderRace, which necessitates mating with equines of other races. If the mermare's foal is female, she'll be a new mermare with different traits depending on her father's race. If the mermare's foal is male, he'll be the same species as his father and feels a connection to the sea.

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* In ''Fanfic/TheBridge'' this is how mermare reproduction works. Mermares are a OneGenderRace, which necessitates mating with equines of other races. If the mermare's foal is female, she'll be a new mermare with different traits depending on her father's race. If the mermare's foal is male, he'll be the same species as his father and feels feel a connection to the sea.

* In ''Fanfic/TheBridge'' this is how mermare reproduction works. Mermares are a OneGenderRace, which necessitates mating with equines of other races. If the mermare's foal is female, she'll be a new mermare with different traits depending on her father's race. If the mermare's foal is male, he'll be the same species as his father and feels a connection to the sea.

** Hags reproduce by ([[VideoGame/NeverwinterNights2 usually]]) kidnapping and raping human males. Female children of such pairing are always hags, while male offspring are brutish hagspawn that serve hags.

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** Hags -- a humanoid species based off of fairytale witches -- reproduce by ([[VideoGame/NeverwinterNights2 usually]]) kidnapping and raping human males. Female children of such pairing are always hags, while male offspring are brutish hagspawn that serve hags.hags.* ''TabletopGame/{{Pathfinder}}'': Hags are AlwaysFemale, and thus need to mate with humanoids, monstrous humanoids or fey to reproduce. The female children resulting from these unions are always hags, while the male children are always members of the father's species, albeit sterile and appearing... [[UncannyValley wrong]], somehow. This is in contrast to ''TabletopGame/DungeonsAndDragons'', ''Pathfinder''[='=]s [[SpiritualSuccessor Spiritual Predecessor]], where the hags originate from and where the results of hag/other unions are either a) AlwaysFemale and always hags, or b) result in female children who become hags and male children who become hulking, misshapen monsters called hagspawn, with little resemblance to their father's species.

** Hags reproduce by ([[VideoGame/NeverwinterNights2 usually]]) kidnapping and raping human males. Female children of such pairing are always hags, while male offspring are brutish hagspawn that serve hags.

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